That’s Not Funny! by Jeanne Willis and Adrian Reynolds

One day, just for a joke, Hyena puts a banana skin on Giraffe's path. When Giraffe slips and collides with a tree, a chain of unfortunate events begins which involves all the other animals. Hyena laughs and laughs at their misfortune. But the other animals have the last laugh when Hyena gets a fitting comeuppance and trips up on his own joke!